In Rosh Online: The Return of Karos, players take on the role of a hero determined to break the curse of darkness falling over the fantasy world of Asmara and ascend to ultimate glory by becoming the mythical Karos warrior. Through quests, guild clashes and large-scale PvP action, Rosh Online's warriors fight to dominate the world's vital energy source, Fletta. Fletta provides the basis for the game's unique and complex alternate progression system. Alongside traditional experience point-based leveling within the game, Fletta energy can be used to increase stats, give buffs, buy resources and enchant items.